Function start_cli_hotkey_server 

pub async fn start_cli_hotkey_server(
    tx: UnboundedSender<()>,
    port_file: PathBuf,
) -> Result<CliHotkeyServerGuard>

Start a local TCP server that accepts hotkey triggers and forwards them to the provided channel.

The server binds to 127.0.0.1:0 (ephemeral) and writes its port to a discovery file.

• tx receives () for each incoming trigger.
• port_file controls the discovery location; use default_cli_hotkey_port_file for production.